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(No Model.)

E.- P. PAYNTER. Jr.

UNION FOR STEAM PIPES.

No. 367,726. Patented Ai1g.- 2, 1887.

iZ-z'ytfi'- WITNEEEEIE IN VEINTCJF! IQ PETERS, Pholwulh n mr. wnhin mmD. C;

UNITED STATES PATENT OEEIcE.

EDXVARD P. PAYNTER, JR, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OFONE-HALF TO JOHN K. MOORE, OF SAME PLACE.

UNION FOR STEAM-PIPES.

SPECIFICATION forming part of Letters Patent No. 367,725, dated August2, 1887.

Application filed April 24, 1886. Serial No. 200,042. (No model.)

To uZZ whom it may concern:

Be it known that I, Enwnnn P. PAYNTER, J12, a citizen of the'UnitedStat-es, residing at Philadelphia,iu the county ofPhiladelphia and Stateof Pennsylvania, have invented certain new and useful Improvements inUnions for Steam-Pipes,'&c.; and I do hereby declare the following to beafull, clear, and exactdescription of the invention, reference being hadto [O the accompanying drawings, which form part of this specification,in which- Figure 1 is a vertical longitudinal section of my invention.Fig. 2 is a side elevation of the, male part of the union. Fig. 3 is aside elevat-ion of the female part of the union. Fig. 4 is a sideelevation of the nut which couples the male and female parts together.

My invention has for its object to provide a construction whereby thejoint of the union of steam and other pipes will be made more tight thanheretofore, and in which the danger of injury by indentation totheseatof such union when said seat is made of soft metal will beavoided.

My invention consists, essentially, in the construction of a union thefemale part of which is provided with a seat of soft metal'or other softmaterial having a concave face or end, the male portion of the unionhaving a convex end'adapted and designed to rest upon or impinge againstthe soft seat of the female portion, Unions have heretofore beenconstructet with soft seats which were flat, and against 33 which theflat or straight end of the opposing part of the union pressed or wasseated. XVith such a union it has been found that the soft seatwasliable to become indented by the opposing part in case the fit wasnot exactly true, 40 and it was difficult or impossible to remove suchindentation, the latter impairing the efficieney of thejoint.

In carrying my invention into effect I provide one of the members of theunion with an internal seat of soft metal or other soft mate rial, theface of which is made concave, and I form the opposing part of the unionwith a convex end, which bears upon or rests against the concave seat,forming a tight joint therewith. The soft metal. or other soft' materialcomposing the seat is made in the form of a washer or ring, which isinserted in an interior annular beveled orundercut groove in the memberof the union which receives it,

said packing or ring being pressed into posiv tion by means of adrop-press, whereby it is expanded so that it cannot lose its positionor come out. The convex end of the other member is ground so as to beperfectly true and concentric with the concave side, against which itrests or presses.

Referring to the accompanying drawings, A represents the female member,B the nut, and O the male member of a union, said nut coupling said maleand female members,the nut and female member being threaded, as usual,to fasten them together, and the male member being formed with ashoulder, which abuts against the flange or end of the nut in the usualmanner. The female member A is formed with an interior annular beveledgroove, (1, which receives a packing or ring, D, of soft metal or othersoft material, capable of and suitable for use as aseatforajointfor asteampi-pe. This packing is in the first place made in the form of awasher or ring of such dianr eter that it may be dropped into theannular groove (4, and after being placed in the latter is acted upon bya dropjwrcss, which expands it so that it :tills the groove a and cannotcome out of the'latter. Any suitable soft metal or alloy capable of useas a packing for a steampipe joint maybe employed for the purpose, andin lieu of soft metal any other equivalent soft material which may beproperly used in the same situation may be employed. Said packing orwasher is formed with a concave face or end, (I, and the end of the malemembcr C is rounded or made convex to conform to the concavity of theseat and to form a perfectly-tight jointtherewith, said rounded orconvex end being ground so as to be perfectly true and correct.

The concavoconvex character of the joint prevents the seat from beingindented even if the two members of the coupling should. not be exactlyaligned, thereby avoiding the difliculty hitherto encountered with thefiat softmetal seats and straight ends of unions as heretoforeconstructed.

\Vhat I claim as my invention is-- 1. A union for steam-pipes,comprising a threaded ring or n'ut,a member having a seat of soft metalwith a concave face, and an opposing member with a rounded or convexend, substantially as shown and described.

2. The combination, in a union for steampipes, consisting of a threadedring or nut and two members, of a member, A, having an interior annulargroove, with a packing ring or washer of soft metal or other softmaterial fitted therein, said packing having a concave side or face,substantially as shown and described.

3. In a union forsteam-pipes,.afemale memher having an annular grooveand expanded ring of soft metal therein with a concave seat 1 or face,in combination with an opposing men1- her having a convex or roundedground end and a threaded ring or nut, substantially as shown anddescribed.

I11 testimony that I claim the foregoing I 20 have hereunto set my handthis 16th day of April, 1886.

EDVARD P. PAYNTER, JR. Vi tn esses:

M. D. OoNNoLLY, WILL H. POWELL.

